*{
    margin: 0;
    padding: 0;

}
.container{
    width: 320px;
    height: 480px;
    background: url("../images/game_bg.jpg") no-repeat 0 0;
    margin: 50px auto;
    position: relative;
}
.container>h1{
    color: white;
    margin-left:60px; 
}
.container>.progress{
    width: 180px;
    height: 16px;;
    background: url("../images/progress.png") no-repeat 0 0;
    position: absolute;
    top:66px;
    left:63px;
}
.container>.start{
    width:150px;
    line-height: 35px;
    text-align: center;
    color: white;
    /*颜色线性渐变*/
    background: linear-gradient(#E55C3D,#C50000);
    border-radius:20px;
    border: none;
    font-size: 20px;
    position: absolute;
    top:320px;
    left: 50%;
    margin-left: -75px;
}
.container>.rules{
    width: 100%;
    height: 20px;
    background: #ccc;
    position: absolute;
    bottom: 0;
    text-align: center;
}
.container>.rule{
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    position: absolute;
    left: 0;
    top:0;
    padding-top: 100px;
    box-sizing: border-box;
    text-align: center;
    display: none;
}
.rule>p{
    color: white;
    line-height: 50px;
}
.rule>a{
    color: red;
}
.container>.mask{
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    position: absolute;
    left: 0;
    top:0;
    padding-top: 200px;
    box-sizing: border-box;
    text-align: center;
    display: none;
}
.mask>h1{
    color: #ff4500;
    text-shadow: 3px 3px #fff;
    font-size: 40px;
}
.mask>button{
    width:150px;
    line-height: 35px;
    text-align: center;
    color: white;
    /*颜色线性渐变*/
    background: linear-gradient(#74ACCF,#007DDC);
    border-radius:20px;
    border: none;
    font-size: 20px;
    position: absolute;
    top:320px;
    left: 50%;
    margin-left: -75px;
}